How can automatically mirror several people's Outlook calendars on a single user's calendar?l

I have a small sales team, their boss, and a telemarketer. Everyone's Outlook calendar is shared so the telemarketer has author permission to add appointments as he makes them for the individual sales people. Is there a way to create a single calendar that their boss can view which will automatically pull in all the calendar items from the various members of the sales team? Or better, automatically add the calendar items to their boss' calendar when anything gets added to one of the sales team's calendar?

I am running a Windows Server 2003 domain with Exchange 2003. The end users are a mix of Outlook 2003 and Outlook 2007.